Tray type liquid fuel burner



Jan, m, 3956 H. a. PIATT El AL. I J

TRAY TYPE LIQUID FUEL BURNER Filed Feb. 6, 1946 5 7 [III I n I i [8 Y filL 1 fi i I i A71. :2 '6 I4 I I I"? 22 l 5 O u 1 2? H9 I. i ll i 1; 1 20 'i W1 1 l f U (I \i H] j M Ii l i m i i I, 2s o 0 o o i 27 lg 23 2s ATTORNEYS Patented Jan. 10, 1950 3w..

UNITED STATES PTA-TENT" OFFICE raAY TYPE 53:33am BURNER Howard I. Piatt and Charles P. Thomas, Lansing,

Mich, assignors to Piatt Products Corporation, Lansing, Mich, a corporation of Michigan Application February 6, 1945; Serial No. 645,910

The invention relates to burners for liquid fuel of the varporizing pot type andhas for one of its objects to provide an improved burner which is so constructed that it produces a clean flame throughout its range from low fire to high fire and may be manufactured at relatively low cost.

The invention has for other objects to provide a burner which is so constructed that both the primary air and the secondary air are preheated and to provide an improved burner comprising a shell which forms the pot and means within the shell for preheating both the primary air and the secondary air.

These and other objects of theinvention will become apparent from the following description, taken in connection with the accompanying drawings, in which Figure l is a plan view of a burner embodying the invention;

Figure 2 is a cross section on the line 2-2 of Figure 1;

Figure 3 is a view similar a modified construction.

The burner for liquid fuel comprises the sheet metal shell I having a cylindrical side wall 2 and the integral bottom wall 3, which latter is preferably provided with the depressed pocket 4 adjacent a portion of the side wall. The burner also comprises the top wall or cover 5 which is preferably formed of sheet metal by a stamping operation and rests upon the upper end of the side wall 2 of the shell. This top wall or cover has the upright inner peripheral flange 8 forming a central opening and is provided with the annular series of peripherally spaced holes or openings I which are preferably formed during the stamping operation. 8 is a bafile extending transversely of the shell between the bottom wall and the top wall or cover and preferably supported upon the side wall of the shell. As shown, the lower portion 9 of the side wall is of less diam= eter than the upper portion I ll to form the internal annular shoulder l l upon which the bafile rests. The bafile has the central outlet l2 and the outer peripheral bead l3 which forms an upwardly opening channel having the inner side wall I, the bottom wall l5 and the outer side wall I 6.

to Figure 2 showing I! is an annular sheet metal wall in the nature of a cylinder fitting within the upright flange 8 of the top wall or cover and resting upon the baflie 8. This annular wall is provided with the annular series of peripherally spaced holes or openings 18 which are preferably elongated.

The baffle is also provided with the annular series of peripherally spaced holes or openings H which extend through the inner side wall M of the bead l3. .20 is aliquid fuel inlet tube fixed to the lower portion 9 of the side wall of the shell and registering with the pocket and 2! is a lighter tube located above the liquid fuel inlet tube and closed during operation of the burner by the cap 22.

Withthe construction as above described, the annular wall llicooperates with the upper portion In of the side wall of the shell, the top wall or cover 5 and the baffle 8 to form an annular chamber for the preheating of the air which enters the chamber through the holes or openings '1. The holes or openings IS in the annular wall provide for the passage of preheated secondary air from the chamber into the space or compartment formed by the annular walland the combined area of these holes or openings is properly proportioned to the combined area of the holes or openings 1 to secure the required velocity of the preheated secondary air passing into the space or compartment. The holes or openings IS in the bafiie 8 provide for the passage of preheated primary air laterally into the space or compartment below the baffle and the combined area of these holes or openings is proportioned to the combined area of the holes or openings l8 to secure the desired relative capacity for the primary air to assure efficient operation of the burner when at low fire through a range from pilot consumption to approximately one-quarter total capacity consumption. The central outlet in the baffle is of materially less diameter than the space or compartment encircled by the annular wall to assist in securing this result.

In the modification illustrated in Figure 3, the general construction is the same as that illustrated in Figures 1 and 2, with the exception that the primary air inlet holes or openings 23 and 24 are provided respectively in the side wall 25 and bottom wall 26 of the outer peripheral bead 21 of the bafiie 28. Relatively few holes or openings, in the neighborhood of three, are provided in the bottom wall. With this construction, there is in addition to the primary air passing laterally into the space below the baflle a relatively small amount of primary air passing downwardly into the space below the bafile to mix with the liquid fuel or vapor and carry the same to the bafile outlet.

What we claim as our invention is: l. A burner for liquid fuel comprising a shell having a side wall and a bottom wall, a top wall for said shell having air inlet openings, a baflie spaced from said bottom and top walls and engaging said side wall, an annular wall cooperating with said side and top walls and said baflle to form an annular air chamber, said annular wall being formed with lateral openings intermediate its ends for the passage of secondary air from said chamber into the space encircled by said annular wall, said baflle being provided with a transverse wall having lateral openings providing for the passage of primary air from said chamber intcr the space below said baffle and also being provided. with an outlet into and of smaller diameter than the space encircled by said annularwall, and" means providing for the passage the space below said baflle.

2. A burner for liquid fuelcomprising. aishell; having side and bottom walls, a top wall for said shell having air inlet openings, a bafilespaced from said bottom and top walls and having an outer'peripheralupwardly' opening-bead engaging said. side wall, an annular wall cooperating witlr said side. and'top walls and said bafllev to formcan. annular chamber, said annular wall having. late eral' openings: for the from said chamber intothe space encircled by said annular wall, said head of said; baiile haw ing'lateral openings for the passage of primary. air from said chamber into. the. space helmesaid baflle, said. bafllehaving an outlet. opening into the space encircled. by said annular wall; and means providing for the. passage of liquid iuel: into. the space below said. baflle.

31A burner'fer-liquid fuel comprising a; shellhaving side and bottomwalls; a top walltionsaid 35 passage of secondary air ofl i'quidiuel'into ou-tlet opening in communication with the space encircled by said annular wall, means for placing-said chamber in communication with the air outside the burner and means providing for the passage of liquid fuel into the space below said bafle;

HOWARD I. PIATI. CHARLES P. THOMAS.

R-EFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2134,29? Breese Oct. 25; 1938 2,214,664 Donley Sept. 10,, 1940 2259343" Fletcher Oct. 21,1941 2,516.8,1'56 Baity Apr. 26,1949

FOREIGN PATENTS Number Country Date 7253429 France Feb. 12, 1932 

